When I run the following the cylindrical pattern seems to be applied in 
only the x dimension.  Is it possible to apply it in x and z dimensions?


          #macro MarkOrigin (Radius)  //mark origin
                 cylinder { -100*y 0*y Radius
		pigment { rgb .5 } finish { ambient .8} }
                 cylinder { -100*z 0*z Radius
		pigment { rgb .5 } finish { ambient .8} }
                 cylinder { -100*x 0*x Radius
		pigment { rgb .5 } finish { ambient .8} }
                 cylinder {  0*y 100*y Radius
		pigment { rgb < 0, 1, 0 > } finish { ambient .8} }
                 cylinder {  0*z 100*z Radius
		pigment { rgb < 0, 0, 1 > } finish { ambient .8} }
                 cylinder {  0*x 100*x Radius
		pigment { rgb < 1, 0, 0 > } finish { ambient .8} } 

          #end
          MarkOrigin (.4)

          camera {
                 location  <-120,60,-80>*3
                 look_at   <250,0,250>
                 angle  55
                 right  x*image_width/image_height
          }
          light_source {
                 0*x
                 color rgb 2.25
                 translate vrotate ( <0,0,-1200>, <60, 45, 0> )
          }
          plane {
                 y, 0
                 pigment {
                         rgb .1
                 }
                 finish {
                         ambient 0
                         diffuse .8
                 }
          }
          #local F_Terrain =
          function {
                 pattern {
                         cylindrical
                         cubic_wave
                 }
          }
          #local Terrain =
          height_field {
                 function 1000,1000 {
			F_Terrain(x,y,z)
		}
                 pigment {
                        function  {
				F_Terrain(x,y,z)
		       }
                        pigment_map {
                                [0 rgb Green]
                                [1 rgb Cyan]
                        }
                 }
                 scale <500, 50, 500 >
          };

          object { Terrain }

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